This is a USA made Mongoose Amplifier which was produced by Amp Research. All the original Amp research suspension is included. The frame is 17 center to top of seat collar with a 21.5 effective top tube length. The item “Amp Research Frame And Fork. Mongoose Amplifier. Vintage” is in sale since Wednesday, July 1, 2020. This item is in the category “Sporting Goods\Cycling\Bicycle Frames”. The seller is “steelbikelover” and is located in Portland, Oregon. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, United arab emirates, Qatar, Kuwait, Croatia, Malaysia, Colombia, Antigua and barbuda, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Saint lucia, Turks and caicos islands, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman islands, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Pakistan, Paraguay, Reunion, Uruguay, Montserrat.

• Wheel Size: 26 in
• Material: Aluminum
• Frame Size: 17 in
• Color: Black
• For Bike Type: Mountain Bike
• Brand: Mongoose
• Set Includes: Frame and Fork

I have this old Amp Research frame that I was going to build up years ago and never got around to it. Its a very solid frame with no issues to keep it from being built and ridden. The frame does have some oxidation on it. I have no idea where it came from and was on the frame when I got it. The water bottle bolt bosses on the lower cage also fell into the frame. Otherwise it is a very solid frame with a great polished finish. The rear shock works very well and will offer many years of worry free use. The frame does say B3 on one side and B4 on the other. No idea why they say something different. The item “Amp Research Frame Polished Aluminum V-Brakes or Amp Disc Brakes 26 Vintage MTB” is in sale since Saturday, May 26, 2018. This item is in the category “Sporting Goods\Cycling\Bicycle Frames”. The seller is “bradotbbikeracers” and is located in Brighton, Colorado. This item can be shipped worldwide.

• Wheel Size: 26 in
• Model: B3 or B4
• Suspension: Front & Rear (Full)
• Type: Mountain Bike
• Color: Polished Aluminum
• MPN: Does Not Apply
• Configuration: Frame Only
• Frame Material: Aluminum
• Brand: Amp Research
• Brake Type: V-Brakeor Amp Disc